Battery-plate



OTT@ P. HOFFMAN, OF CH'ICAG-O, ILLTNQIS.

BATTEBYPLATE aaa-inra.

Specification of Letters Patent.

Patented une fr, i920.

` application inea May 24, 191e. serial No. 299,453.

To all wwm it may concern.'

Be it known that l', Grro 1). HOFFMAN,-

' a citizen-oi Germani residincr at Chica' o` andvin one aspect relates to the providing ci storage battery plates 'which will effectively hold the active material (such as lead oxid) interiori' d with the metal of the plate, 'While parini ng the ready expansion and c action of both the metal pla-te and the actire material `vvithont causing either warping or distortion ot' the plate or a cracking and dropping out of the active maerial. More particularly, my invention aims to provide a storage battery plate hav-- ing ribs dividingfsections or" the plate into cells adapted to hold the active material, and having the consecutive ribs so shapedv asto resista 4movement of continuously connected parts of the active material toward relatively opposite faces of the plate. Furthermore, my invention aims to provide such an` interconnecting of the active material in adjacent cells ot' the plate as to avoid a cracking of this material, 'and to lafford cross-connecting portions of active mate rial which will coperate with the shape of the ribs in .holding the entire filling of each plate section in position. lv'loreover, roy invention aiins to provide anchoring lugsextending partly across the indivifglnal cells and also formed for interlocking with active material to hold the latter in position' in the cell, and for deterring the cracking of the active material. Likewise, my invention aims to provide a battery platev ernbodying the above features and having the 'parts so arranged as to be cheaply andv speedily manuiactnred., Still further objects will appear .trai the' following speer {ication and om the. accompanying drawings in vwhich:

Figure l is an eievation ot' one corner section of the battery plate embodying my invention.

Fig, is an Aenlarged perspective view olf the ext-renie corner vportieri oi' the plate of Fig.

'ribs reduced in number toavoid confusion Fig. 3y is a vertical Section taken' through the. plate portion of Fig. 1 along the line In the drawings, my invention is shown. as embodied in a battery plate of the gen'- el'al type in which relatively heavy bars divide the plate into sections or panels, and in Which each panel is divided into parallel `cells by relatively thin ribs.v For example Fig.- l 'shows a battery plate having 'edge portions l and bars 2 and 3 borderingone panel of the same. This panel is divided into cells by the'ribs 4: and, the space between these ribs being exaggerated and the in the drawing. Both the edge bar 1 and the panel bars 2 and 3 are desirably rectangular in cross section, While the intermediate ribse and 5'are of tapering crosssections, With the taper oppositelyv directed on consecutive ribs. lFor example, the ribs here shown as triangular in cross-section, with the sharp edge on the iirst rib `directed toward one face of the plate, with the sharp edgefof the second of these ribs directed toward the vother face of the plate, and so 0n.` Then I eqnip'thesel ribs With grooves extending transversely of the. saine and desirably/aciross the narrow faces, So as to afford channels connecting the consecutive cells.

lVhen the paste of lead oXid or the like is introduced into the cells for the grid above described, this active material not only fills the relis, butv also lills the channels '7, so that the active material in each panel.v of the plate consists of a series of vpaiiallel portions 6 disfiosed between the ribs and connectedr to ea'cli other 4by'lstrips .Sas shown in' Fig; 3. These connecting strips therefore'iinit'e. the entire mass of the active material into. single body, so that its constituentl portions are not free to move in different directions. l also desirably make the ribs of less depth 'than the panel bars l, 2 and 3, so -that'the' Paste when flush -vcith these bar Willentcnd over the thin edges of the ribs. LConsequently, since the slope ot the walls ot the ribs would only permit each panel section to nove in the one direction, the different directions of these slopes will cooperate with `the connecting strips 8 in holding tl entire mass of active material interloclred with 'the plate. However, these strip connections will not interfere with the expansion ot' the 

